Javascript Operators
Written By: Avinash Malhotra
Updated on
Operators
Javascript Operators are used to operate tasks like assign, addition, subtract, compare values etc. JavaScript has arithmetic, logical, assignment and comparison operators.
JavaScript also has binary, unary operator including one ternary operator (conditional operator).
Type of Operators in Javascript
Binary operator
Binary operators required two operands, one before and one after operator. x+y=z
x (operand) +(operator) y(operand)Unary Operator
Unary operators required only one operand, either before or after operator. i++
x++++xTernary Operator
Ternary Operator is conditional operator in javaScript witch use three operands. For Example, (3>2) ? console.log("yes"): console.log("no") will print yes and (1>2) ? console.log("yes"): console.log("no") will print no.
(3>2) ? console.log("yes"): console.log("no");(1>2) ? console.log("yes"): console.log("no");Arithmetic Operators
An Arithmetic operator is used to perform Arithmetic operations between values. Like Addition, Subtraction, Multiplication, Division etc
Arithmetic operators in JavaScript
| Operator | Description | Example |
|---|---|---|
| + | Addition, can also concat | 2+3=5 "2" + 3 = "23" |
| - | Subtraction | 5-3=2 "5" - 3 = 2 |
| * | Multiply | 2*3=6 |
| / | Divide | 6/3=2 |
| % | Remainder | 6%3=0 |
| ++ | Increment, y++ means y = y+1 | var y=2; ++y; y=3 |
| -- | Decrement, y-- means y = y-1 | var y=2; --y; y=1 |
| ** | Exponentiation Operator | 2**3 returns 8 |
The ** Exponentiation Operator was introduced in JS ES7. There is no support for Exponentiation Operator in IE browser, chrome<52 and Firefox<52
Logical Operators
Logical Operators are used to check logic between two operators. and (&&), or (||) and not (!) are logical operators.
Logical Operators in JavaScript
| Operator | Description | Example |
|---|---|---|
| && | and, when both are correct | 2 < 5 && 2> 1 is true |
| || | or, when any one is correct | var x=2, 2>5 || x==2 is true |
| ! | not | !(2==3) is true |
Assignment Operators
Assignment operators ars used to assign some value to js variables. =, +=, -=, *=, /= are all assignment operators in javascript.
Assignment Operators in JavaScript
| Operator | Description | Example |
|---|---|---|
| = | Assignment | x=2; means x is 2 |
| += | Addition Assignment | let x=2; x+=2 means x=x+2 |
| -= | Subtraction Assignment | let x=2; x-=2 means x=x-2 |
| *= | Multiplication Assignment | let x=2; x*=2 means x=x*2 |
| /= | Division Assignment | let x=2; x/=2 means x=x/2 |
| ?? | Nullish coalescing | null ?? 0 return 0 undefined ?? 0 return 0 |
The ?? Nullish coalescing was introduced in JS ES 2021.
Comparison Operators
Comparison operators are used in a statement to compare two values. Like == is used to compare values but === is used to compare values and datatypes.
Comparison Operators in JavaScript
| Operator | Description | Example |
|---|---|---|
| == | Equal to, check value only |
2 == "2" is true true == 1 is true undefined == null is true |
| === | Strict equal to, check value and data type both | 2==="2" is false true === 1 is false undefined === null is false |
| != | not equal | 2!=1 is true |
| !== | not strict equal | 2!=="2" is true |
| > | greater than | 2> 5 is false, & 2 <5 is true |
| >= | greater than or equal to | 3>=3 is true |
| < | less than | 1< 3 is true |
| <= | less than or equal to | 2<=2 is true |